// Author: combacsa@kaist.ac.kr
// http://www.jungol.co.kr/prog/Hanal/hanalView.php?qs_code=116

//#define COMPILE
#ifdef COMPILE

#include <fstream>
#include <iomanip>
using namespace std;

double round(double x) {
	return (double)(int)(x * 10.0 + 0.5) / 10.0;
}

int main() {
	ifstream in("input.txt");
	int a, b, c;
	in >> a >> b >> c;
	in.close();
	ofstream out("output.txt");
	out << fixed << setprecision(1) << round((double)(a + b + c) / 3.0) << "점" << endl;

	return 0;
}
#endif
